卡塔尔采购需求：门到门配送、海运、空运、铁路运输、海运门到门、国际空运

I'm looking for a detailed quotation for door-to-door air freight services from China to Doha, Qatar. The shipment consists of packaging materials with an approximate weight of 85 kg and a total volume of 0.23 CBM, packed in 3 cartons. It's essential to know your best DDP air freight rate and the estimated transit time for this shipment. Additionally, please confirm if customs clearance and final delivery to Doha are included in your rate. I would also appreciate a list of required documents from the supplier to ensure a smooth shipping process. Looking forward to your prompt response with all the necessary details.